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US 4,908,603 AGranted
Light emitting alarm board
OwnerSatoshi Yamaue, Koichi Tanaka +3inventors
InventorsSatoshi Yamaue, Koichi Tanaka, Hiroaki Nakaya, Takuo Yamashita, Masaru Yoshida
Life of this patent
Estimating the term…
Abstract
A light-emitting alarm board uses thin-film EL elements which emit light of different colors individually or simultaneously, depending on the voltages applied thereon, thereby serving as display lamps for indicating the conditions of operation of a system being monitored.
Claims6
A light-emitting alarm board comprising a board, and
- a plurality of thin-film EL elements adapted to emit light of different colors according to voltages applied thereon, said EL elements being stacked on said board and one on top of another in the direction of light emission therefrom, each of said EL elements being provided with an electrode terminal such that one or more of said EL elements can be selectably caused to emit light of one of said different colors or an intermediate color of said different colors, said alarm board thereby serving as display lamps for indicating the condition of operation of a system being monitored.
Dependencies are inferred from the claim text.